340 with edelbrock heads overheating

The thing is, if the valves on the Edelbrocks are making contact, what's to stop the iron head valves from hitting? I know the Eddys have 2.02 and 1.6 but that's splittin hairs when discussing piston to valve clearance.
The Piston is chasing the intake valve to close. .140 / .070 is a big difference in that case